Duplicating-machine.



H. G. LIEBENTHAL.

DUPLIGATING MACHINE.

APPLICATION FILED MAE.25, 1913.

1,085,617. Patented Feb. 3, 1914.

g1 1JH PY(f H. 5 M U 25 I H FI7-H.. 20 J] j WITNESSES: J] J INVENLZR:

x 7 MW ZZ 1 W (75 HERMAN G. LIEBENTHAL, OF PHILADELPHIA, BEN'NSYLVANIA, .ASSIGNOR TO KATHERINE R. OKANE, OF PHILADELPHIA, PENNSYLVANIA.

DUPLICATING-MACHINE.

Specification of Letters Patent.

, Patented Feb. 3, 1914.

Application filed March 25, 1913. Serial No. 756,742.

My improvement is particularly applicable to printing machines of the type known commercially as the Multigraph comprising a rotary printing cylinder having a series of under cut channels in its perimeter extending parallel with its axis to receive complementary shaped flanged type which said cylinder presents in opposition to the other member of the printing couple. As ordinarily constructed, the printed i.npressions from such a machine are irregular in accordance with the length of the lines of type; because the lines of type extend parallel with the axis of the printing cyliir der and are successively pressed between the members of the printing couple with a given )ressure which, being the same for each line, is variable per unit of length of the line. For instance. a line one-half the length of the cylinder would be printed with a pressure, per unit of length of that line. double the pressure per unit of length of a line which is the full length of the cylinder, and consequently the shorter the lines the more deeply and darkly they are printed.

Therefore, it is the object oi' my invcntion to provide such a machine with means to equalize the pressure per unit of area upon the successive lines of type in compensation for variations in the length of the lines; so that the printed impressions made from successive lines shall be uniform in depth and darkness regardless of differences in the length of said lines.

My invention provides make-ready devices adapted to be used in connection with the successive lines of type to sustain a portion of the pressure in the regions of the line which otherwise would be blank. and, as hereinafter described. such devices include filling blocks which fit in the type channels in said cylinder and carry surface strips adapted to extend in alinemcnt with the type faces and between the inking rib bon and the platen; said strips being preterably provided with rubbcr or other resilient COVBI'S.

My invention compri es the various novel features of construction and arrangemcnt hereinafter more definitely spccitied.

In the drawings; Figure [is a side elc\'ation of a rotary printing cylinder and a rcciprocatory plane platen, such as are c1n ployed in a machine of the type spcciticd. Fig. 11 is a fragmentary plan view of a portion of said cylinder with letter type and filling blocks set therein. Fig. lll is a, fragmentary transverse sectional view of the elements shown in Fig. ll. taken on the line III. III. Fig IV is, a fragmentary longi tudinal sectional view taken on the line 1V. iv in Figs. .1 and [11. Fig. is a frag nientary longitudinal sectional view taken on the line V. V in l igs. It and ill. Fig. \l is a longitudinal sect onal view of a modified form ot tilling block carrying a strip having its end cast therein.

In said drawings; the rotary printing cylinder 1 has the undercut channels 2 extending parallel with its axis, and each type 3, l. and 5 is provided with flanges t3 colnplementary to and titted in said channels. and all of said type are clamped together. in the direction of the length ot the lines of words. by any suitable means.

As indicated in Fig. 11 the address and salutation compose separate lines set in successive channels 2 in the printing drum 1 and extending onl a small traction of the length of said drum. Consequently. unle s means are provided to equalize the pressure per unit ot length of the lines. said short lines will be much more deeply and darkly printed than the succeeding lines which are of greater length: because the whole pressure between the members of the printing couple is borne by each line in succession as it i brought. by rotation of the printing drum. to a position normal to the plane of said platen the inking ribbon i which is carried by said drum 1 extending between the spools 10 over the type fa es. between said faces and said platen, being pressed into the paper more or less deeply in accordance with the pressure per unit of length of the line which is bcing printed. Therefore. I povi le means to bear a portion of the pressure at the ends of the short lines so as to lessens the pressure upon the type faces conr posing such lines. and IV blocks 12, conveniently formed of cast metal having .fianges 13 complementary to and fitted in said channels 2 like the flanges '6 of the type aforesaid. Said blocks 12 carry the surface strips 15, conveniently formed of resilient metal attached to said blocks at their outer ends, by any convenient means, for instance solder, soas to extend in alinement with, the type faces between the inking ribbon 9 and the platen 8, and conveniently provided with the resilient tubular rubber covers 16. It may be observed that the construction and arrangement above described is such that a portion of the printing pressure is borne by said strips 15 and their supporting blocks 12 so as to lessen the pressure upon the faces of the type 3 and 4 set between said blocks.

It may be observed that the form of my invention including the blocks 12 provided with the strips 15 is such that said strips cannot overlie the ribbon 9 the full length of said blocks and therefore, although of simple construction, is objectionable if the ribbon used is of such width that said blocks would project beyond the ends of the channels 2. Therefore, I prefer to employ in conjunction with wider ribbons, devices constructed and arrangedas shown in Figs. III and V, includingthe filling blocks 20, conveniently formed of pressed sheet metal tubes, carrying the surface strips 21 which are attached thereto at their ends extending in said tubes and are also conveniently pro- As shown in Figs. III

vided with resilient tubular rubber covers 23. As shown in Fig. III said filling blocks 20 have no flanges to engage the undercut portions of the channels 2, and therefore may be introduced in said channels radially with respect to the printing drum, as distinguished from the filling blocks 12 above described which being provided with such flanges 13 must be set in said channels by introduction at the end thereof. However it is to be understood that, as indicated in Figs. II and III, prmsed sheet metal blocks 25, otherwise similar to the blocks 20 above described, may be provided with flanges 26 for engagement with the channels 2 like the flanges 13 on the blocks 12 above described. Moreover, although I have shown the cast metal blocks 12 carrying the strips 15 attached at their ends upon the exterior of said blocks; it is to be understood that they maybe attached by being embedded in the cast metal of the blocks. For instanrua, as shown in Fig. VI, the filling blocks 30, otherwise similar to the blocks 12 above described, carry surface strips 31 which have their ends attached to said blocks by being embedded therein, said ends being perforated as indicated at 32 so that the cast metal extends therethrough.

such means includes the filling I do not-desire to limit myself to the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention as defined in the appended claims.

I claim 1. In a duplicating machine, the combination with a platen; of a rotary printing drum having a plurality of undercut channels in its periphery; type having flanges fitted in said channels; an inking ribbon interposed between the type faces and said platen; a filling block having flanges fitted to said channels and carrying a surface strip adapted to extend in alinement with the type faces between the inking ribbon and the platen; and a resilient tubular rubber cover for said strip; whereby a portion of the printing pressure is borne by said strip.

2. In a duplicating machine, the combination with a platen; of a rotary printing drum having a' plurality of channels in its periphery; type fitted :in said channels; all lnking ribbon interposed between the ty faces and said platen; a filling block fitted to said channels and carrying a surface adapted to extend in alinement with the ty e faces between the inking ribbon and tiie platen; and a resilient tubular cocci for said strip; whereby a portion of the printing pressure is borne by said strip.

3. In a duplicating machine, the combination with a platen; of a rotary rinting drum having a plurality of channe s in its periphery; type fitted in said channels; an inking ribbon interposed between the type faces and said platen; a filling block fitted to said channels and carrying a surface strip adapted to extend in alinement with the type faces between the inking ribbon and the platen; and a tubular cover for said strip; whereby a portion of the printing pressure is borne by said strip.

4. In a duplicating machine, the combination. with a platen; of a rotary printing drum having a plurality of channels in its periphery; type fitted in said channels; an inking ribbon interposed between the type faces and said platen; a filling block fitted to said channels and carrying a surface strip adapted to extend in alinement with the type faces between the inking ribbon ,and the platen; and a yielding cover for said strip; whereby a portion of the printing pressure is borne by said strip. i

5.- In a du licating machine, ,the com bination with a p atep ;'of a rotary printing drum having a plurality of channels in its periphery; type fitted in said channels; an inking ribbon interposed between the tiyp'e faces and said platen; and a filling bloc said channels and carrying a surface strip adapted to extend in alinement with the type fitted to I faces between the inking ribbon and the platen; whereby a portion of the printing pressure is borne by said strip.

6. A device of the character described, including a filling block having flanges extending longitudinally thereon, a surface strip carried by said block in spaced relation therewith throughout a portion of its length, and a resilient tubular cover for said strip.

7. A device of the character described, including a filling block having flanges extending longitudinally thereon, a surface strip carried by said block in spaced relation therewith throughout a portion of its length, and a tubular cover for said strip.

8. A device of the character described, including a filling block having flanges extending longitudinally thereon, a surface strip carried by said block in spaced relation therewith throughouta portion of its length, and a yielding cover for said strip.

9. A device of the character described, arranged to cooperate with a type holder, including a filling block, distinct from the type holder and adapted to be set therein as a type, having flanges extending longitudinally thereon. and a surface strip carried by said block in spaced relation therewith throughout. a portion of its length.

10. In a duplicating machine, the combination with a type holding member having a plurality of undercut type channels in in its surface; of means for lessening the pressure upon short lines of type therein, including a strip of flexible resilient sheet metal, having at one end thereof means detachably connecting it with said type holding member, including an element,extend-' ing in'one of said channels and having flanges engaging the overhanging ledges therein.

11; In a duplicating machine, the combination with a type holding member having a plurality of undercut type channels in its surface, of means for .lessening the pressure upon short lines of type therein, including a strip of sheet metal, having at one end thereof means detachably connecting it with said type holding member, including an element extending in one of said channels and having flanges engaging the overhanging ledges therein.

12. In a duplicating machine, the combination with a type holding member; of an inking ribbon, carried by said member; mcans for lessening the pressure upon short lines of type in said member, including a surface strip overlying said ribbon; and means at one end of said, strip detachably connecting it with said member, including a type shaped block.

13. In a duplicating machine, the combination with a type holding member; of an inking ribbon. carried by said member; means For lessening the pressure upon short lines of type. in said member, including a surface strip overlying said ribbon; and means at one end of said strip detachably connecting it-with said member.

14. The combination .with a printing couple including a member having means to hold type in lines; of an inking ribbon carried by said member interposed between the members of said couple; and a surface strip separable from but supported by said member, adapted to extend in alinement with type faces, over said ribbon; whereby a portion of the printing pressure between the members of said couple is borne by said strip.

15. The combination with a printing couple including a member having means to hold type in lines; of an inking ribbon interposed between the members of said couple; and a surface strip separable from but supported by said member, adapted to extend in alinement with type faces, over said ribbon; whereby a portion of the printing pressure between the members of said couple is borne by said strip.

16. The combination with a printing cou- )le of an inkin ribbon inter msed between the members of said couple; and an element interposed between the members of said couple, bearing upon said ribbon; whereby a portion of the printing pressure between the members of said couple is borne by said element.

17. The combination wit-h a printing couple including a. member having means to hold type in lines; of an inking ribbon carried by said member interposed between said couple; and a surface strip separable from but supported by said member, adapted to extend in alinement with type faces, over said ribbon; whereby a portion of the printing pressure between said couple is borne by said strip.

18. The combination with a printing couple including a member having means to hold type in lines; of an inking ribbon interposed between said couple; and a surface strip separable from but supported by said member, adapted to extend in alinement with type-faces, over said ribbon; whereby a portion of the printing pressure between said couple is borne by said strip.

19. The combination with a printing couple. including a member having means to hold type in lines; of an inking ribbon interposed between said couple; and a surface strip supported by said member, adapted to extend in alinement with type faces, over said ribbon; wherebya portion of the printing pressure between said couple is borne by said strip.

20. The. combination with a printing couple including a member having means to hold type in lines; of an inking ribbon interposed between said couple; and a surface strip edapteci to extend. in alinem entwith pressurebetween couple is borne by type faces, over .said ribbon whereby a. porsaid strip tion of t'he printing i essure betyveen said -In testimony whereof, I have hereunto couple is borne bysai strip. v signed my name at Philadelphia, Pennsyl- 5 7 21, The' combination with a. printing couv Vania, this 24th day of March, 1913. 1 1e including a member having. means -to 'HERMAN G LIEBENTHAL old type in lines; of a; surface strip separable from but sufported by said member, Witnesses; adapted to exten over blank type faces f E. PAIGE, 10. therein; whereby a. portion of the printing ,E'rnmn M. IMSCHWEILEB. I 

